Speedo Kids' UPF 50+ Polywog Swimsuit Floatation Suit Flotation top features built-in foam inserts to encourage upright position in the water as kids develop their swim skills. Fabric offers UV 50+ protection to block the suns harmful rays. S/M : ages 1-2 years / weight up tp 33 lbs. (15 kgs) / Chest 20" M/L : ages 2-4 years / weight 33-45 lbs. (15-20.4 kgs) / Chest 22" 2-piece Suit